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公开(公告)号：BR9814761A
公开(公告)日：2000-10-17
申请号：BR9814761
申请日：1998-12-18
Applicant: MOTOROLA INC
Inventor： GHOSH AMITAVA , LABEDZ GERALD PAUL , HAAS KENNETH A
Abstract: Base stations (101, 102) utilize a spreading code that is dependent upon whether the particular base station (101) is operating in a synchronized, or an unsynchronized mode. Unsynchronized base stations (102) within the communication system (100) utilize a long code unique to the particular base station (102), and base stations (101) operating in a synchronized mode utilize a time shifted version of the same long code. To reduce the search time for remote units (113) within the communication system (100), a group identification code (GIC) (305) is broadcast during a time period that the long code is masked. The GIC (305) indicates a (spreading code) long code group to which the long code of each base station belongs. Additionally, each base station (101, 102) within the communication system (100) determines its synchronization status and utilizes a particular GIC (305) and long code based on the base station's synchronization status.
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公开(公告)号：FR2753035B1
公开(公告)日：2000-06-16
申请号：FR9710884
申请日：1997-09-02
Applicant: MOTOROLA INC
Inventor： BUFORD KEVIN A , REED JOHN DOUGLAS , ROZANSKI WALTER J JR , GHOSH AMITAVA
Abstract: A method for determining a subscriber unit location in a communication system is provided. The method includes the steps of receiving a signal from the subscriber unit at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.
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公开(公告)号：FI990379A0
公开(公告)日：1999-02-22
申请号：FI990379
申请日：1999-02-22
Applicant: MOTOROLA INC
Inventor： BUFORD KEVIN A , REED JOHN D , ROZANSKI WALTER J , GHOSH AMITAVA
Abstract: A method for determining a subscriber unit location in a communication system is provided. The method includes the steps of receiving a signal from the subscriber unit at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.
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公开(公告)号：IT1284380B1
公开(公告)日：1998-05-18
申请号：ITRM960306
申请日：1996-05-06
Applicant: MOTOROLA INC
Inventor： GHOSH AMITAVA , REED JOHN DOUGLAS , ROZANSKI WALTER JOSEPH JR , BUFORD KEVIN ANDREW
Abstract: A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.
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公开(公告)号：CA2264077A1
公开(公告)日：1998-03-12
申请号：CA2264077
申请日：1997-08-27
Applicant: MOTOROLA INC
Inventor： BUFORD KEVIN A , REED JOHN D , ROZANSKI WALTER J JR , GHOSH AMITAVA
IPC: G01S3/02 , G01S5/02 , G01S5/04 , G01S5/12 , G01S19/14 , H04W64/00 , H04Q7/22 , G01S5/00 , H04Q7/36
Abstract: A method for determining a subscriber unit location in a communication system including the steps of receiving a signal from the subscriber unit (1390) at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first received time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.
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Patent Agency Ranking
公开(公告)号：FR2753035A1
公开(公告)日：1998-03-06
申请号：FR9710884
申请日：1997-09-02
Applicant: MOTOROLA INC
Inventor： BUFORD KEVIN A , REED JOHN DOUGLAS , ROZANSKI WALTER J JR , GHOSH AMITAVA
Abstract: A method for determining a subscriber unit location in a communication system including the steps of receiving a signal from the subscriber unit (1390) at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first received time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.
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公开(公告)号：BR9606418A
公开(公告)日：1997-09-02
申请号：BR9606418
申请日：1996-05-10
Applicant: MOTOROLA INC
Inventor： GHOSH AMITAVA , ROHANI KAMYAR
Abstract: A transmitter transmits the desired signal using a continuous duty cycle at transmission rates of less than full rate (FIG. 6 ). The energy used in each power control group is related to the transmission rate. By repeating the power control groups, time division diversity (FIG. 6 ) is provided. In the receiver, the received power control groups are analyzed and compared to several levels of energy thresholds (73, 75, 77, 79). The results of the comparisons are converted into a power control signal (74, 76, 78, 80, 81) and returned to the mobile. The mobiles are capable of selecting the appropriate bit (93) and adjusting their power (94). Alternatively, an indicator of the transmission rate can be forwarded (155) in advance of the frame. The receiver compares a power estimate with the threshold for the transmission rate indicated (166).
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公开(公告)号：SE9700287L
公开(公告)日：1997-04-30
申请号：SE9700287
申请日：1997-01-31
Applicant: MOTOROLA INC
Inventor： GHOSH AMITAVA , ROHANI KAMYAR
Abstract: A transmitter transmits the desired signal using a continuous duty cycle at transmission rates of less than full rate (FIG. 6 ). The energy used in each power control group is related to the transmission rate. By repeating the power control groups, time division diversity (FIG. 6 ) is provided. In the receiver, the received power control groups are analyzed and compared to several levels of energy thresholds (73, 75, 77, 79). The results of the comparisons are converted into a power control signal (74, 76, 78, 80, 81) and returned to the mobile. The mobiles are capable of selecting the appropriate bit (93) and adjusting their power (94). Alternatively, an indicator of the transmission rate can be forwarded (155) in advance of the frame. The receiver compares a power estimate with the threshold for the transmission rate indicated (166).
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79.发明申请
公开(公告)号：WO2008042527A3
公开(公告)日：2008-12-11
申请号：PCT/US2007076862
申请日：2007-08-27
Applicant: MOTOROLA INC , WANG FAN , BENES STANLEY J , GHOSH AMITAVA , TAN JUN
Inventor： WANG FAN , BENES STANLEY J , GHOSH AMITAVA , TAN JUN
CPC classification number: H01Q3/30 , H01Q3/2605 , H04B7/0634 , H04B7/0636 , H04L5/14 , H04L25/0204 , H04L25/0228 , H04L25/03343 , H04L2025/03426
Abstract: A subscriber unit (104) with multiple receive antennas (160, 162) and a single transmit antenna (160) derives beamforming weights to be used at a base station (102) with multiple transmitting antennas (602, 604, 606, and 608). The downlink beamforming weights are derived at the subscriber unit (104) from a prior downlink transmission from the base station (102) to the subscriber device (104) and an uplink sounding signal is used to carry derived downlink beam forming weights to the base station (102). Downlink antenna specific pilots (without weight) are used at the subscriber device (104) to determine the beamforming weights. Decimated sounding signals, where the number of sounding subcarriers is al least the same as the number of antennas at the base station (102), allow multiple users to sound at the same time.
Abstract translation: 具有多个接收天线（160,162）和单个发射天线（160）的用户单元（104）导出要在具有多个发射天线（602,604,606和608）的基站（102）处使用的波束成形权重， 。 下行链路波束形成权重是由用户单元（104）从基站（102）到用户设备（104）的先前下行链路传输导出的，并且上行链路探测信号用于将导出的下行链路波束形成权重传送给基站 （102）。 在用户设备（104）处使用下行链路天线专用导频（没有重量）来确定波束成形权重。 其中探测子载波的数量与基站（102）处的天线的数量至少相同的分样探测信号允许多个用户同时发声。
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80.发明申请
公开(公告)号：WO2007084840B1
公开(公告)日：2008-02-21
申请号：PCT/US2007060453
申请日：2007-01-12
Applicant: MOTOROLA INC , TAN JUN , GHOSH AMITAVA , RATASUK RAPEEPAT , WANG FAN , XIAO WEIMIN
Inventor： TAN JUN , GHOSH AMITAVA , RATASUK RAPEEPAT , WANG FAN , XIAO WEIMIN
IPC: H04B7/216
CPC classification number: H04L27/2613 , H04J13/004 , H04J13/102 , H04L5/0007 , H04L5/0021 , H04L5/0048 , H04L25/0228 , H04L27/2605 , H04L27/2655
Abstract: A system and method for initializing a system communication without previous reservations for random access channel (RACH) access includes a first step of defining at least one spread sequence derived from at least one constant amplitude zero autocorrelation sequence. A next step includes combining the spread sequence with a Walsh code to form an extended spread sequence. A next step includes using the extended spread sequence in a preamble for a RACH. A next step includes sending the preamble to a BTS for acquisition. A next step includes monitoring for a positive acquisition indicator from the BTS. A next step includes scheduling the sending of a RACH message. A next step includes sending the RACH message.
Abstract translation: 用于初始化系统通信而没有对随机接入信道（RACH）接入的先前保留的系统和方法包括定义从至少一个恒定幅度零自相关序列导出的至少一个扩展序列的第一步骤。 下一步包括将扩展序列与沃尔什码组合以形成扩展扩展序列。 下一步包括在RACH的前同步码中使用扩展扩展序列。 下一步包括将前导码发送到BTS进行采集。 下一步包括监测来自BTS的正采集指示符。 下一步包括调度RACH消息的发送。 下一步包括发送RACH消息。
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